Floyd Mayweather autograph seekers need to pay VERY close attention … ’cause the boxing superstar has one specific demand when signing his signature.

Money was at the Manny Pacquiao vs. Keith Thurman fight in Vegas over the weekend … when a female fan asked him to sign a boxing glove for her.

Floyd grabbed for the glove — fully prepared to scribble his John Hancock — but after a quick inspection, he pulled back and told her he wouldn’t sign.

And, why not?? He’s got a reason …

“You already got some names on it, baby. You gotta have gloves with just me on it!!”

Yep, Floyd Mayweather won’t share autograph space with other boxers — and the proof is in the video.

No word on how long Floyd has had the no-sharing policy — but c’mon, would you expect anything less from a guy who calls himself “The Best Ever?!”

ANDY RUIZ: PACQUIAO WOULD BEAT MAYWEATHER

The champ is here … and Andy Ruiz is picking Manny Pacquiao to BEAT Floyd Mayweather if they can work out a deal for a rematch.

After 40-year-old Manny’s impressive victory over Keith Thurman this weekend, there’s more talk than ever about a Pacquiao vs. Mayweather II.

And, since Andy was AT the Pacquiao vs. Thurman fight, we asked the heavyweight champ for his professional opinion … who wins?!

“I think Manny because hes been more active,” Ruiz told TMZ Sports on his way out of Trejo’s Tacos in Los Angeles.

Andy cautions people not to count out Floyd because “Mayweather is Mayweather. He’s always good. He stays in shape, takes care of himself … but it would be an awesome fight.”

But, when push comes to shove, Andy says he’d put his money on Manny.

Of course, the first time Floyd fought Manny back in 2015, Floyd won by unanimous decision … though it was later revealed Pacquiao had a shoulder injury going into the fight.

Even though Floyd hasn’t taken a real pro fight in years, it’s obvious why he would be open to a rematch — Floyd reportedly made around $300 mil for the first fight, Manny is said to have raked in around $100 mil.

As for Andy, he’s working on a rematch with Anthony Joshua … the undefeated fighter he BEAT earlier this year to win the title.

He’s also looking to get a movie made about his life — he’s already calling himself the “Mexican Rocky” … and judging by the video, Danny Trejo approves!